Failed to handle key=<C-h>. Cannot read property 'match' of undefined

To Reproduce
Steps to reproduce the behavior:

1. Go to 'linux cpp file'
2. Click on 'crlt+y''
3. It will do nothing
4. See error

VSCodeVim version: 1.18.5

TypeError: Failed to handle key=<C-h>. Cannot read property 'match' of undefined
    at Function.immediateMatchingBracket (/home/a/.vscode/extensions/vscodevim.vim-1.18.5/out/extension.js:1:180639)
    at S (/home/a/.vscode/extensions/vscodevim.vim-1.18.5/out/extension.js:11:65270)
    at /home/a/.vscode/extensions/vscodevim.vim-1.18.5/out/extension.js:11:66134
    at t.ExtHostTextEditor.edit (/snap/code/52/usr/share/code/resources/app/out/vs/workbench/services/extensions/node/extensionHostProcess.js:652:191)
    at v.execute (/home/a/.vscode/extensions/vscodevim.vim-1.18.5/out/extension.js:11:66108)
    at F.runAction (/home/a/.vscode/extensions/vscodevim.vim-1.18.5/out/extension.js:11:171693)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (internal/process/task_queues.js:94:5)
    at F.handleKeyAsAnAction (/home/a/.vscode/extensions/vscodevim.vim-1.18.5/out/extension.js:11:170974)
    at F.handleKeyEvent (/home/a/.vscode/extensions/vscodevim.vim-1.18.5/out/extension.js:11:167812)
    at Object.promise (/home/a/.vscode/extensions/vscodevim.vim-1.18.5/out/extension.js:9:211972)
    at Object.runTasks (/home/a/.vscode/extensions/vscodevim.vim-1.18.5/out/extension.js:11:327644)

Reproduce the failure in VS Code 1.18.5 with a Linux C++ file and the reported key sequence, then inspect the immediateMatchingBracket entry point shown in out/extension.js. Done means the key no longer raises the reported TypeError and performs its expected action.